How do we know that genes play a role in pubertal timing?
A) Because researchers have identified a gene that triggers puberty and can track the timing.
B) Because identical twins experience menarche at about the same time, whereas fraternal twins can vary by a year or more.
C) Because there are no other consistent reasons for why puberty occurs.
D) Because siblings of all ages experience puberty at about the same age.

Question

Quizplus · Accepted Answer

The fact that identical twins experience menarche at about the same time but fraternal twins can vary by a year or more suggests that genetic factors are playing a role in determining pubertal timing. This provides evidence that genes are involved in the process.

How Do We Know That Genes Play a Role in Pubertal